Regulatory Matters - (Details 2) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Renasant Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 665,707	$ 495,168
Tier 1 Capital to Average Assets (Leverage) - Ratio	8.95%	8.91%
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 576,360	$ 0
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	9.92%	0.00%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 665,707	$ 495,168
Tier One Risk Based Capital to Risk Weighted Assets - Ratio	11.46%	11.82%
Total Capital to Risk-Weighted Assets - Amount	$ 712,737	$ 543,103
Capital to Risk Weighted Assets - Ratio	12.27%	12.96%
Renasant Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Average Assets (Leverage) - Amount	$ 639,189	$ 467,944
Tier 1 Capital to Average Assets (Leverage) - Ratio	8.75%	8.64%
Common Equity Tier 1 Capital to Risk-Weighted Assets - Amount	$ 639,189	$ 0
Common Equity Tier 1 Capital to Risk-Weighted Assets - Ratio	11.02%	0.00%
Tier 1 Capital to Risk-Weighted Assets - Amount	$ 639,189	$ 467,944
Tier One Risk Based Capital to Risk Weighted Assets - Ratio	11.02%	11.46%
Total Capital to Risk-Weighted Assets - Amount	$ 685,565	$ 515,993
Capital to Risk Weighted Assets - Ratio	11.82%	12.59%